Yes only US stocks

There’s no way to guarantee “very large gains” after a crisis; markets are uncertain and past patterns don’t ensure future results. What these filters do is tilt the search toward U.S. stocks that are:

• Hit hard in the current crisis (so they may be “on sale”),
• Financially solid enough to survive, and
• Have a history of strong growth and higher volatility (which can amplify upside in a recovery).

Screening Filters

1. Region: United States (region: ['United States'])

   • Purpose: Limit the universe to U.S. companies.
   • Rationale: You explicitly asked for “US stocks,” and U.S. markets (NYSE/Nasdaq) have deep liquidity, strong disclosure standards, and are usually central in global recoveries.

2. Exchange: NYSE & Nasdaq (list_exchange: ['XNYS', 'XNAS'])

   • Purpose: Focus on major U.S. exchanges.
   • Rationale: NYSE and Nasdaq list larger, more established, and better-regulated companies, making it easier to access reliable financial data and trade with good liquidity—important if you’re trying to position for a strong post-crisis move.

3. High Beta / High Risk (beta: ['HighRisk'])

   • Purpose: Target more volatile stocks.
   • Rationale: High-beta stocks tend to fall more than the market in a downturn but also rise more in a recovery. If you’re seeking “very large gains,” you usually need higher volatility; this filter selects names that historically move more than the overall market (both up and down).

4. Big Recent Price Drop (year_price_change_pct: min -80, max -30)

   • Purpose: Find stocks that have already fallen sharply (down 30%–80% over the last year).
   • Rationale: To capture large upside, you often look for companies that have been heavily sold off during the crisis. This range aims to avoid:
     • Stocks that have barely fallen (less room for rebound), and
     • Those that are down more than 80% (which might indicate severe, possibly permanent damage).
       It concentrates on “deeply beaten down but not totally destroyed.”

5. Current Ratio ≥ 1.2 (current_ratio: min 1.2)

   • Purpose: Ensure reasonable short-term liquidity.
   • Rationale: A current ratio above 1.0 means current assets cover current liabilities; 1.2 adds a safety buffer. For post-crisis gains, the company must survive the crisis without a liquidity crunch or distress equity raise that could dilute shareholders.

6. Debt-to-Equity ≤ 1.5 (debt_equity: max 1.5)

   • Purpose: Control leverage risk.
   • Rationale: Highly indebted companies are at much greater risk in crises—higher bankruptcy risk, covenant breaches, or forced asset sales. Capping D/E at 1.5 helps exclude the most overleveraged names, focusing on those with more manageable balance sheets that can participate in the rebound instead of just trying to stay alive.

7. Revenue 5-Year CAGR ≥ 10% (revenue_5yr_cagr: min 10)

   • Purpose: Require a history of solid top-line growth.
   • Rationale: To aim for “very large” returns on the other side of a crisis, you generally want companies that were growing well before the downturn. A 10%+ revenue CAGR over five years indicates:
     • Structural growth drivers (e.g., market share gains, expanding market, strong product/service demand),
     • A business that could resume faster growth once conditions normalize, potentially fueling a sharp recovery in the stock price.

8. EPS 5-Year CAGR ≥ 10% (eps_5yr_cagr: min 10)

   • Purpose: Require strong earnings growth, not just sales growth.
   • Rationale: Earnings growth is ultimately what supports sustained price appreciation. A 10%+ EPS CAGR over five years suggests:
     • Improving profitability and/or scale,
     • Operational efficiency, and
     • A management team that has historically converted revenue into growing profits—critical for strong post-crisis rerating and multiple expansion.

Why Results Match Your Goal

• The high beta and large recent price drops align with your desire for very large upside by focusing on volatile names that have been heavily marked down in the crisis.
• The current ratio and debt-to-equity constraints help ensure these are not “zombie” companies but businesses with a reasonable chance of surviving and recovering.
• The 5-year revenue and EPS growth filters aim at companies with proven growth engines, which are better candidates to rebound strongly when the crisis fades.
• Restricting to U.S. stocks on NYSE/Nasdaq directly matches your request and keeps the focus on liquid, transparent markets.

Together, the screen is looking for:
U.S. growth companies with strong historical fundamentals and manageable balance sheets that have been hit hard in the current crisis and are volatile enough to potentially deliver outsized gains if/when the market recovers—without guaranteeing that outcome.